Problema con xmlrpc.php

Estimados!
Mi problema es cuando intento comunicar mu blog con otras aplicaciones como el plugin jetpack, o blogsy para el ipad.

En Jet pack me aparece este reporte al querer comunicar con wordpress.com:
Error Details: The Jetpack server could not communicate with your site’s XML-RPC URL. Please check to make sure http://juancarloslucas.com.ar/xmlrpc.php is working properly. It should show ‘XML‑RPC server accepts POST requests only.’ on a line by itself when viewed in a browser and should not have any blank links or extra output anywhere.

Al cargar http://juancarloslucas.com.ar/xmlrpc.php en el navegador recibo este reporte:
Warning: ini_set() has been disabled for security reasons in /home/juancarl/public_html/wp-includes/load.php on line 278
Warning: Cannot modify header information – headers already sent by (output started at /home/juancarl/public_html/wp-includes/load.php:278) in /home/juancarl/public_html/wp-includes/class-IXR.php on line 372

Espero sus recomendaciones.

Muchas gracias!
JUAN